Display number of lights turned on i a group

@r1kkie wrote:

Hi,

Anyone now how to display how many lights in a group that are turned on?
Either a template sensor or preferably embedded in a custom:button-card under label or custom_varible.

- type: custom:button-card
  template: device_button
  entity: group.livingroom_lights
  name: Lampor
  label: >
       [[[ *code for displaying number of lights turned on* ]]]

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